const assert = require('assert')
const http = require('http')
const https = require('https')
const path = require('path')
const fs = require('fs')
const send = require('send')
const auth = require('basic-auth')
const { closeWindow } = require('./window-helpers')

const { ipcRenderer, remote } = require('electron')
const { ipcMain, session, BrowserWindow, net } = remote

/* The whole session API doesn't use standard callbacks */
/* eslint-disable standard/no-callback-literal */

describe('session module', () => {
  let fixtures = path.resolve(__dirname, 'fixtures')
  let w = null
  let webview = null
  const url = 'http://127.0.0.1'

  beforeEach(() => {
    w = new BrowserWindow({
      show: false,
      width: 400,
      height: 400
    })
  })

  afterEach(() => {
    if (webview != null) {
      if (!document.body.contains(webview)) {
        document.body.appendChild(webview)
      }
      webview.remove()
    }

    return closeWindow(w).then(() => { w = null })
  })

  describe('session.defaultSession', () => {
    it('returns the default session', () => {
      assert.strictEqual(session.defaultSession, session.fromPartition(''))
    })
  })

  describe('session.fromPartition(partition, options)', () => {
    it('returns existing session with same partition', () => {
      assert.strictEqual(session.fromPartition('test'), session.fromPartition('test'))
    })

    it('created session is ref-counted', () => {
      const partition = 'test2'
      const userAgent = 'test-agent'
      const ses1 = session.fromPartition(partition)
      ses1.setUserAgent(userAgent)
      assert.strictEqual(ses1.getUserAgent(), userAgent)
      ses1.destroy()
      const ses2 = session.fromPartition(partition)
      assert.notStrictEqual(ses2.getUserAgent(), userAgent)
    })
  })

  describe('ses.cookies', () => {
    it('should get cookies', (done) => {
      const server = http.createServer((req, res) => {
        res.setHeader('Set-Cookie', ['0=0'])
        res.end('finished')
        server.close()
      })
      server.listen(0, '127.0.0.1', () => {
        const port = server.address().port
        w.loadURL(`${url}:${port}`)
        w.webContents.on('did-finish-load', () => {
          w.webContents.session.cookies.get({ url }, (error, list) => {
            if (error) return done(error)
            for (let i = 0; i < list.length; i++) {
              const cookie = list[i]
              if (cookie.name === '0') {
                if (cookie.value === '0') {
                  return done()
                } else {
                  return done(`cookie value is ${cookie.value} while expecting 0`)
                }
              }
            }
            done('Can\'t find cookie')
          })
        })
      })
    })

    it('calls back with an error when setting a cookie with missing required fields', (done) => {
      session.defaultSession.cookies.set({
        url: '',
        name: '1',
        value: '1'
      }, (error) => {
        assert(error, 'Should have an error')
        assert.strictEqual(error.message, 'Setting cookie failed')
        done()
      })
    })

    it('should over-write the existent cookie', (done) => {
      session.defaultSession.cookies.set({
        url,
        name: '1',
        value: '1'
      }, (error) => {
        if (error) return done(error)
        session.defaultSession.cookies.get({ url }, (error, list) => {
          if (error) return done(error)
          for (let i = 0; i < list.length; i++) {
            const cookie = list[i]
            if (cookie.name === '1') {
              if (cookie.value === '1') {
                return done()
              } else {
                return done(`cookie value is ${cookie.value} while expecting 1`)
              }
            }
          }
          done('Can\'t find cookie')
        })
      })
    })

    it('should remove cookies', (done) => {
      session.defaultSession.cookies.set({
        url: url,
        name: '2',
        value: '2'
      }, (error) => {
        if (error) return done(error)
        session.defaultSession.cookies.remove(url, '2', () => {
          session.defaultSession.cookies.get({ url }, (error, list) => {
            if (error) return done(error)
            for (let i = 0; i < list.length; i++) {
              const cookie = list[i]
              if (cookie.name === '2') return done('Cookie not deleted')
            }
            done()
          })
        })
      })
    })

    it('should set cookie for standard scheme', (done) => {
      const standardScheme = remote.getGlobal('standardScheme')
      const origin = standardScheme + '://fake-host'
      session.defaultSession.cookies.set({
        url: origin,
        name: 'custom',
        value: '1'
      }, (error) => {
        if (error) return done(error)
        session.defaultSession.cookies.get({ url: origin }, (error, list) => {
          if (error) return done(error)
          assert.strictEqual(list.length, 1)
          assert.strictEqual(list[0].name, 'custom')
          assert.strictEqual(list[0].value, '1')
          assert.strictEqual(list[0].domain, 'fake-host')
          done()
        })
      })
    })

    it('emits a changed event when a cookie is added or removed', (done) => {
      const { cookies } = session.fromPartition('cookies-changed')

      cookies.once('changed', (event, cookie, cause, removed) => {
        assert.strictEqual(cookie.name, 'foo')
        assert.strictEqual(cookie.value, 'bar')
        assert.strictEqual(cause, 'explicit')
        assert.strictEqual(removed, false)

        cookies.once('changed', (event, cookie, cause, removed) => {
          assert.strictEqual(cookie.name, 'foo')
          assert.strictEqual(cookie.value, 'bar')
          assert.strictEqual(cause, 'explicit')
          assert.strictEqual(removed, true)
          done()
        })

        cookies.remove(url, 'foo', (error) => {
          if (error) return done(error)
        })
      })

      cookies.set({
        url: url,
        name: 'foo',
        value: 'bar'
      }, (error) => {
        if (error) return done(error)
      })
    })

    describe('ses.cookies.flushStore(callback)', () => {
      it('flushes the cookies to disk and invokes the callback when done', (done) => {
        session.defaultSession.cookies.set({
          url: url,
          name: 'foo',
          value: 'bar'
        }, (error) => {
          if (error) return done(error)
          session.defaultSession.cookies.flushStore(() => {
            done()
          })
        })
      })
    })
  })

  describe('ses.clearStorageData(options)', () => {
    fixtures = path.resolve(__dirname, 'fixtures')
    it('clears localstorage data', (done) => {
      ipcMain.on('count', (event, count) => {
        ipcMain.removeAllListeners('count')
        assert.strictEqual(count, 0)
        done()
      })
      w.loadFile(path.join(fixtures, 'api', 'localstorage.html'))
      w.webContents.on('did-finish-load', () => {
        const options = {
          origin: 'file://',
          storages: ['localstorage'],
          quotas: ['persistent']
        }
        w.webContents.session.clearStorageData(options, () => {
          w.webContents.send('getcount')
        })
      })
    })
  })

  describe('will-download event', () => {
    beforeEach(() => {
      if (w != null) w.destroy()
      w = new BrowserWindow({
        show: false,
        width: 400,
        height: 400
      })
    })

    it('can cancel default download behavior', (done) => {
      const mockFile = Buffer.alloc(1024)
      const contentDisposition = 'inline; filename="mockFile.txt"'
      const downloadServer = http.createServer((req, res) => {
        res.writeHead(200, {
          'Content-Length': mockFile.length,
          'Content-Type': 'application/plain',
          'Content-Disposition': contentDisposition
        })
        res.end(mockFile)
        downloadServer.close()
      })

      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        const url = `http://127.0.0.1:${port}/`

        ipcRenderer.sendSync('set-download-option', false, true)
        w.loadURL(url)
        ipcRenderer.once('download-error', (event, downloadUrl, filename, error) => {
          assert.strictEqual(downloadUrl, url)
          assert.strictEqual(filename, 'mockFile.txt')
          assert.strictEqual(error, 'Object has been destroyed')
          done()
        })
      })
    })
  })

  describe('DownloadItem', () => {
    const mockPDF = Buffer.alloc(1024 * 1024 * 5)
    const protocolName = 'custom-dl'
    let contentDisposition = 'inline; filename="mock.pdf"'
    const downloadFilePath = path.join(fixtures, 'mock.pdf')
    const downloadServer = http.createServer((req, res) => {
      if (req.url === '/?testFilename') contentDisposition = 'inline'
      res.writeHead(200, {
        'Content-Length': mockPDF.length,
        'Content-Type': 'application/pdf',
        'Content-Disposition': contentDisposition
      })
      res.end(mockPDF)
      downloadServer.close()
    })

    const isPathEqual = (path1, path2) => {
      return path.relative(path1, path2) === ''
    }
    const assertDownload = (event, state, url, mimeType,
      receivedBytes, totalBytes, disposition,
      filename, port, savePath, isCustom) => {
      assert.strictEqual(state, 'completed')
      assert.strictEqual(filename, 'mock.pdf')
      assert.ok(path.isAbsolute(savePath))
      assert.ok(isPathEqual(savePath, path.join(__dirname, 'fixtures', 'mock.pdf')))
      if (isCustom) {
        assert.strictEqual(url, `${protocolName}://item`)
      } else {
        assert.strictEqual(url, `http://127.0.0.1:${port}/`)
      }
      assert.strictEqual(mimeType, 'application/pdf')
      assert.strictEqual(receivedBytes, mockPDF.length)
      assert.strictEqual(totalBytes, mockPDF.length)
      assert.strictEqual(disposition, contentDisposition)
      assert(fs.existsSync(downloadFilePath))
      fs.unlinkSync(downloadFilePath)
    }

    it('can download using WebContents.downloadURL', (done) => {
      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        ipcRenderer.sendSync('set-download-option', false, false)
        w.webContents.downloadURL(`${url}:${port}`)
        ipcRenderer.once('download-done', (event, state, url,
          mimeType, receivedBytes,
          totalBytes, disposition,
          filename, savePath) => {
          assertDownload(event, state, url, mimeType, receivedBytes,
            totalBytes, disposition, filename, port, savePath)
          done()
        })
      })
    })

    it('can download from custom protocols using WebContents.downloadURL', (done) => {
      const protocol = session.defaultSession.protocol
      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        const handler = (ignoredError, callback) => {
          callback({ url: `${url}:${port}` })
        }
        protocol.registerHttpProtocol(protocolName, handler, (error) => {
          if (error) return done(error)
          ipcRenderer.sendSync('set-download-option', false, false)
          w.webContents.downloadURL(`${protocolName}://item`)
          ipcRenderer.once('download-done', (event, state, url,
            mimeType, receivedBytes,
            totalBytes, disposition,
            filename, savePath) => {
            assertDownload(event, state, url, mimeType, receivedBytes,
              totalBytes, disposition, filename, port, savePath,
              true)
            done()
          })
        })
      })
    })

    it('can download using WebView.downloadURL', (done) => {
      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        ipcRenderer.sendSync('set-download-option', false, false)
        webview = new WebView()
        webview.src = `file://${fixtures}/api/blank.html`
        webview.addEventListener('did-finish-load', () => {
          webview.downloadURL(`${url}:${port}/`)
        })
        ipcRenderer.once('download-done', (event, state, url,
          mimeType, receivedBytes,
          totalBytes, disposition,
          filename, savePath) => {
          assertDownload(event, state, url, mimeType, receivedBytes,
            totalBytes, disposition, filename, port, savePath)
          document.body.removeChild(webview)
          done()
        })
        document.body.appendChild(webview)
      })
    })

    it('can cancel download', (done) => {
      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        ipcRenderer.sendSync('set-download-option', true, false)
        w.webContents.downloadURL(`${url}:${port}/`)
        ipcRenderer.once('download-done', (event, state, url,
          mimeType, receivedBytes,
          totalBytes, disposition,
          filename) => {
          assert.strictEqual(state, 'cancelled')
          assert.strictEqual(filename, 'mock.pdf')
          assert.strictEqual(mimeType, 'application/pdf')
          assert.strictEqual(receivedBytes, 0)
          assert.strictEqual(totalBytes, mockPDF.length)
          assert.strictEqual(disposition, contentDisposition)
          done()
        })
      })
    })

    it('can generate a default filename', function (done) {
      if (process.env.APPVEYOR === 'True') {
        // FIXME(alexeykuzmin): Skip the test.
        // this.skip()
        return done()
      }

      downloadServer.listen(0, '127.0.0.1', () => {
        const port = downloadServer.address().port
        ipcRenderer.sendSync('set-download-option', true, false)
        w.webContents.downloadURL(`${url}:${port}/?testFilename`)
        ipcRenderer.once('download-done', (event, state, url,
          mimeType, receivedBytes,
          totalBytes, disposition,
          filename) => {
          assert.strictEqual(state, 'cancelled')
          assert.strictEqual(filename, 'download.pdf')
          assert.strictEqual(mimeType, 'application/pdf')
          assert.strictEqual(receivedBytes, 0)
          assert.strictEqual(totalBytes, mockPDF.length)
          assert.strictEqual(disposition, contentDisposition)
          done()
        })
      })
    })

    describe('when a save path is specified and the URL is unavailable', () => {
      it('does not display a save dialog and reports the done state as interrupted', (done) => {
        ipcRenderer.sendSync('set-download-option', false, false)
        ipcRenderer.once('download-done', (event, state) => {
          assert.strictEqual(state, 'interrupted')
          done()
        })
        w.webContents.downloadURL(`file://${path.join(__dirname, 'does-not-exist.txt')}`)
      })
    })
  })

  describe('ses.protocol', () => {
    const partitionName = 'temp'
    const protocolName = 'sp'
    const partitionProtocol = session.fromPartition(partitionName).protocol
    const protocol = session.defaultSession.protocol
    const handler = (ignoredError, callback) => {
      callback({ data: 'test', mimeType: 'text/html' })
    }

    beforeEach((done) => {
      if (w != null) w.destroy()
      w = new BrowserWindow({
        show: false,
        webPreferences: {
          partition: partitionName
        }
      })
      partitionProtocol.registerStringProtocol(protocolName, handler, (error) => {
        done(error != null ? error : undefined)
      })
    })

    afterEach((done) => {
      partitionProtocol.unregisterProtocol(protocolName, () => done())
    })

    it('does not affect defaultSession', (done) => {
      protocol.isProtocolHandled(protocolName, (result) => {
        assert.strictEqual(result, false)
        partitionProtocol.isProtocolHandled(protocolName, (result) => {
          assert.strictEqual(result, true)
          done()
        })
      })
    })

    xit('handles requests from partition', (done) => {
      w.webContents.on('did-finish-load', () => done())
      w.loadURL(`${protocolName}://fake-host`)
    })
  })

  describe('ses.setProxy(options, callback)', () => {
    it('allows configuring proxy settings', (done) => {
      const config = { proxyRules: 'http=myproxy:80' }
      session.defaultSession.setProxy(config, () => {
        session.defaultSession.resolveProxy('http://localhost', (proxy) => {
          assert.strictEqual(proxy, 'PROXY myproxy:80')
          done()
        })
      })
    })

    it('allows bypassing proxy settings', (done) => {
      const config = {
        proxyRules: 'http=myproxy:80',
        proxyBypassRules: '<local>'
      }
      session.defaultSession.setProxy(config, () => {
        session.defaultSession.resolveProxy('http://localhost', (proxy) => {
          assert.strictEqual(proxy, 'DIRECT')
          done()
        })
      })
    })
  })

  describe('ses.getBlobData(identifier, callback)', () => {
    it('returns blob data for uuid', (done) => {
      const scheme = 'temp'
      const protocol = session.defaultSession.protocol
      const url = `${scheme}://host`
      before(() => {
        if (w != null) w.destroy()
        w = new BrowserWindow({ show: false })
      })

      after((done) => {
        protocol.unregisterProtocol(scheme, () => {
          closeWindow(w).then(() => {
            w = null
            done()
          })
        })
      })

      const postData = JSON.stringify({
        type: 'blob',
        value: 'hello'
      })
      const content = `<html>
                       <script>
                       const {webFrame} = require('electron')
                       webFrame.registerURLSchemeAsPrivileged('${scheme}')
                       let fd = new FormData();
                       fd.append('file', new Blob(['${postData}'], {type:'application/json'}));
                       fetch('${url}', {method:'POST', body: fd });
                       </script>
                       </html>`

      protocol.registerStringProtocol(scheme, (request, callback) => {
        if (request.method === 'GET') {
          callback({ data: content, mimeType: 'text/html' })
        } else if (request.method === 'POST') {
          let uuid = request.uploadData[1].blobUUID
          assert(uuid)
          session.defaultSession.getBlobData(uuid, (result) => {
            assert.strictEqual(result.toString(), postData)
            done()
          })
        }
      }, (error) => {
        if (error) return done(error)
        w.loadURL(url)
      })
    })
  })

  describe('ses.setCertificateVerifyProc(callback)', () => {
    let server = null

    beforeEach((done) => {
      const certPath = path.join(__dirname, 'fixtures', 'certificates')
      const options = {
        key: fs.readFileSync(path.join(certPath, 'server.key')),
        cert: fs.readFileSync(path.join(certPath, 'server.pem')),
        ca: [
          fs.readFileSync(path.join(certPath, 'rootCA.pem')),
          fs.readFileSync(path.join(certPath, 'intermediateCA.pem'))
        ],
        requestCert: true,
        rejectUnauthorized: false
      }

      server = https.createServer(options, (req, res) => {
        res.writeHead(200)
        res.end('<title>hello</title>')
      })
      server.listen(0, '127.0.0.1', done)
    })

    afterEach(() => {
      session.defaultSession.setCertificateVerifyProc(null)
      server.close()
    })

    it('accepts the request when the callback is called with 0', (done) => {
      session.defaultSession.setCertificateVerifyProc(({ hostname, certificate, verificationResult, errorCode }, callback) => {
        assert(['net::ERR_CERT_AUTHORITY_INVALID', 'net::ERR_CERT_COMMON_NAME_INVALID'].includes(verificationResult), verificationResult)
        assert([-202, -200].includes(errorCode), errorCode)
        callback(0)
      })

      w.webContents.once('did-finish-load', () => {
        assert.strictEqual(w.webContents.getTitle(), 'hello')
        done()
      })
      w.loadURL(`https://127.0.0.1:${server.address().port}`)
    })

    it('rejects the request when the callback is called with -2', (done) => {
      session.defaultSession.setCertificateVerifyProc(({ hostname, certificate, verificationResult }, callback) => {
        assert.strictEqual(hostname, '127.0.0.1')
        assert.strictEqual(certificate.issuerName, 'Intermediate CA')
        assert.strictEqual(certificate.subjectName, 'localhost')
        assert.strictEqual(certificate.issuer.commonName, 'Intermediate CA')
        assert.strictEqual(certificate.subject.commonName, 'localhost')
        assert.strictEqual(certificate.issuerCert.issuer.commonName, 'Root CA')
        assert.strictEqual(certificate.issuerCert.subject.commonName, 'Intermediate CA')
        assert.strictEqual(certificate.issuerCert.issuerCert.issuer.commonName, 'Root CA')
        assert.strictEqual(certificate.issuerCert.issuerCert.subject.commonName, 'Root CA')
        assert.strictEqual(certificate.issuerCert.issuerCert.issuerCert, undefined)
        assert(['net::ERR_CERT_AUTHORITY_INVALID', 'net::ERR_CERT_COMMON_NAME_INVALID'].includes(verificationResult), verificationResult)
        callback(-2)
      })

      const url = `https://127.0.0.1:${server.address().port}`
      w.webContents.once('did-finish-load', () => {
        assert.strictEqual(w.webContents.getTitle(), url)
        done()
      })
      w.loadURL(url)
    })
  })

  describe('ses.createInterruptedDownload(options)', () => {
    it('can create an interrupted download item', (done) => {
      ipcRenderer.sendSync('set-download-option', true, false)
      const filePath = path.join(__dirname, 'fixtures', 'mock.pdf')
      const options = {
        path: filePath,
        urlChain: ['http://127.0.0.1/'],
        mimeType: 'application/pdf',
        offset: 0,
        length: 5242880
      }
      w.webContents.session.createInterruptedDownload(options)
      ipcRenderer.once('download-created', (event, state, urlChain,
        mimeType, receivedBytes,
        totalBytes, filename,
        savePath) => {
        assert.strictEqual(state, 'interrupted')
        assert.deepStrictEqual(urlChain, ['http://127.0.0.1/'])
        assert.strictEqual(mimeType, 'application/pdf')
        assert.strictEqual(receivedBytes, 0)
        assert.strictEqual(totalBytes, 5242880)
        assert.strictEqual(savePath, filePath)
        done()
      })
    })

    it('can be resumed', (done) => {
      const fixtures = path.join(__dirname, 'fixtures')
      const downloadFilePath = path.join(fixtures, 'logo.png')
      const rangeServer = http.createServer((req, res) => {
        let options = { root: fixtures }
        send(req, req.url, options)
          .on('error', (error) => { done(error) }).pipe(res)
      })
      ipcRenderer.sendSync('set-download-option', true, false, downloadFilePath)
      rangeServer.listen(0, '127.0.0.1', () => {
        const port = rangeServer.address().port
        const downloadUrl = `http://127.0.0.1:${port}/assets/logo.png`
        const callback = (event, state, url, mimeType,
          receivedBytes, totalBytes, disposition,
          filename, savePath, urlChain,
          lastModifiedTime, eTag) => {
          if (state === 'cancelled') {
            const options = {
              path: savePath,
              urlChain: urlChain,
              mimeType: mimeType,
              offset: receivedBytes,
              length: totalBytes,
              lastModified: lastModifiedTime,
              eTag: eTag
            }
            ipcRenderer.sendSync('set-download-option', false, false, downloadFilePath)
            w.webContents.session.createInterruptedDownload(options)
          } else {
            assert.strictEqual(state, 'completed')
            assert.strictEqual(filename, 'logo.png')
            assert.strictEqual(savePath, downloadFilePath)
            assert.strictEqual(url, downloadUrl)
            assert.strictEqual(mimeType, 'image/png')
            assert.strictEqual(receivedBytes, 14022)
            assert.strictEqual(totalBytes, 14022)
            assert(fs.existsSync(downloadFilePath))
            fs.unlinkSync(downloadFilePath)
            rangeServer.close()
            ipcRenderer.removeListener('download-done', callback)
            done()
          }
        }
        ipcRenderer.on('download-done', callback)
        w.webContents.downloadURL(downloadUrl)
      })
    })
  })

  describe('ses.clearAuthCache(options[, callback])', () => {
    it('can clear http auth info from cache', (done) => {
      const ses = session.fromPartition('auth-cache')
      const server = http.createServer((req, res) => {
        const credentials = auth(req)
        if (!credentials || credentials.name !== 'test' || credentials.pass !== 'test') {
          res.statusCode = 401
          res.setHeader('WWW-Authenticate', 'Basic realm="Restricted"')
          res.end()
        } else {
          res.end('authenticated')
        }
      })
      server.listen(0, '127.0.0.1', () => {
        const port = server.address().port
        function issueLoginRequest (attempt = 1) {
          if (attempt > 2) {
            server.close()
            return done()
          }
          const request = net.request({
            url: `http://127.0.0.1:${port}`,
            session: ses
          })
          request.on('login', (info, callback) => {
            attempt += 1
            assert.strictEqual(info.scheme, 'basic')
            assert.strictEqual(info.realm, 'Restricted')
            callback('test', 'test')
          })
          request.on('response', (response) => {
            let data = ''
            response.pause()
            response.on('data', (chunk) => {
              data += chunk
            })
            response.on('end', () => {
              assert.strictEqual(data, 'authenticated')
              ses.clearAuthCache({ type: 'password' }, () => {
                issueLoginRequest(attempt)
              })
            })
            response.on('error', (error) => { done(error) })
            response.resume()
          })
          // Internal api to bypass cache for testing.
          request.urlRequest._setLoadFlags(1 << 1)
          request.end()
        }
        issueLoginRequest()
      })
    })
  })

  describe('ses.setPermissionRequestHandler(handler)', () => {
    it('cancels any pending requests when cleared', (done) => {
      const ses = session.fromPartition('permissionTest')
      ses.setPermissionRequestHandler(() => {
        ses.setPermissionRequestHandler(null)
      })

      webview = new WebView()
      webview.addEventListener('ipc-message', (e) => {
        assert.strictEqual(e.channel, 'message')
        assert.deepStrictEqual(e.args, ['SecurityError'])
        done()
      })
      webview.src = `file://${fixtures}/pages/permissions/midi-sysex.html`
      webview.partition = 'permissionTest'
      webview.setAttribute('nodeintegration', 'on')
      document.body.appendChild(webview)
    })
  })
})